Photorefractive temporal frequency band-pass, band-reject, and high-pass optical spatial filters using Michelson interferometry

Antao Chen; Hongyu Ding; Shaoqing Fan

doi:10.1117/12.169444

1 March 1994 Photorefractive temporal frequency band-pass, band-reject, and high-pass optical spatial filters using Michelson interferometry

Antao Chen, Hongyu Ding, Shaoqing Fan

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Proceedings Volume 2237, Optical Pattern Recognition V; (1994) https://doi.org/10.1117/12.169444
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

Full optical implementation of band-pass, band-reject and high-pass temporal frequency spatial filters for amplitude images are proposed. These filters rely on the exponential temporal response of photorefractive crystals and the interference with phase conjugate beams. Band- pass and high-pass filters may be realized using a phase conjugate Michelson interferometer which has a difference in the response times between two arms, and band-reject filter using the interference between the output from a band-pass filter and a reference beam. The frequency characteristics of these filters are analyzed with numerical examples, and an analogy of these optical filters to corresponding electronic circuits is introduced.

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Antao Chen, Hongyu Ding, and Shaoqing Fan "Photorefractive temporal frequency band-pass, band-reject, and high-pass optical spatial filters using Michelson interferometry", Proc. SPIE 2237, Optical Pattern Recognition V, (1 March 1994); https://doi.org/10.1117/12.169444

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KEYWORDS

Crystals

Optical filters

Phase conjugation

Bandpass filters

Spatial filters

Electronic filtering

Image filtering

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